Adds UI for creating new Panels.
Moved grid size and dashboard_id defaults for new Panels out of PanelOptions and into the addPanel method.
Removing some unused code from PanelManager.
Updated the handling of panel defaults to clean up PanelOptions and make certain params non-editable in the UI.
Adds "Display Names" for each panel which display in the sidebar.
Instead of requiring a hard-coded lat/lng for WeatherPanel, just ask for a city/address and geocode it via Google Maps API